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x in (-oo:+oo)
(1/2)*x^2+3*x = 10 // - 10
(1/2)*x^2+3*x-10 = 0
1/2*x^2+3*x-10 = 0
DELTA = 3^2-(-10*1/2*4)
DELTA = 29
DELTA > 0
x = (29^(1/2)-3)/(1/2*2) or x = (-29^(1/2)-3)/(1/2*2)
x = 29^(1/2)-3 or x = -(29^(1/2)+3)
x in { -(29^(1/2)+3), 29^(1/2)-3 }
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